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Tung-Sol kt170 tube started glowing brighter

I installed 8 Tong-Sol kt170 tubes in my Sonic Frontier Power 2 amp. One tube started glowing a bright orange, yellow at the lower portion. I hear no sound interference. Should I replace it? If so, replace paired, right channel quad or all eight for matching purposes? I did swap the tube into different socket and it is the tube.

128x128kitegod
kitegod's avatar
kitegod OP
36 posts
 

The designer said the KT170 tubes would work. They are a new tube to the market. These were brand new and played for 50 hours for this to happen. Of course I biased the tubes. I’m pulling the amp and placing my solid state Arye amp back in. I’m almost positive I’ll go back to KT150 tubes. I don’t hear the prat that I got when I had KT150 tubes installed. They needed replaced, hence here I am.

noromance's avatar
noromance
9,480 posts
 

You sure it's not just part of the heater filament being more exposed?

kitegod's avatar
kitegod OP
36 posts
 

I don't know tubes to this extent. This is why I posted. I do know that a repair of the amp is forever and $$ so I'm reaching out for help.

jacobsdad2000
433 posts
 

KT170 tubes have been around for several years. Have you moved that tube to another hole to see if it is the tube or your amp? 

kitegod's avatar
kitegod OP
36 posts
 

Yes, the tube was moved and I can confirm it is the tube. My question is about matching and all the numbers that that go with that. I moved the tube, I biased all tubes and googled a lot. Can I replace the one tube I buy to replace the bad tube and bias the 8 tubes over again and be where I should be at a great result?

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